Gas pump for refrigerating apparatus, etc.



than 5 2926 R. w, TIBBETTS ET AL GAS PUMP FOR REFHIGERATING APPARATUSETC 7 Original Filed March 27, 1920 cjwbewtow M23;

N w 2 \d \m/ I PatentedJan. 5,1926. v

. UNITED 7 STATES;

natuonn w. firearms, or was-r aoxeuav, MASSACHUSETTS, AND

1 or rawrucsnrr, nnonn IsLANDL To all whom it may concern.

.PATEN mm s; evens,

,qlqas rum? roa :anramana'rme ArrAnA'rUs, mo.

A n aami filed Karon aao, Serial No. 3m mam September s, 1925.

Be it known that we, RArMoNuW. TIB- Bn'r'rs and Mi ror: S. Cunrrs,citizens of the United States, residing at West Roxbury, Massachusetts,and. Pawtucket, Rhode Island, respectively, have invented certain newand useful Improvements in Gas Pumps for Refrigerating Apparatusyete, ofwhich the following is a specification, reference being. hadth'erein tothe accompanying'drawing', Y

Qurinven'tion has especial reference-to refrigerating apparatus of thetype having a rotary pump for compressing the refrigerant andanimportant object of our invention is to reduce to a minimum the amountof work the pump must do upon the oil or other liquid used for sealingand lubrication. Another object of our invention ,isto diminish to asshort a time as possible the contact of gas and oil in the pump andthereby lessen the absorption of gas by the oil when the gas'is soluble.Besides attaining these objects T and advantages, our invention achievesother advantages, which will be appreciated by those skilled in the art,when the embodiment of our invention in its constructlon and operatlonis learned from the annexed drawing and the ensuing description. Ourinventlon conslsts in such construction and relationof the parts asdefined by or. embraced within thelanguage' of the appended claims. I

In the accompanying drawing, F1g. 1 1s a vertical section through thepump mechanism of a refrigerating apparatus embodying our invention;Fig. 2 is a side elevat on of the pump detached from the supporting wallof the chamber in which the pump 1s located; Fig.- 3 is a top planview.with the cover for the oil tank or reservoir removed.

In the embodiment of our invention shown in the drawing, there 1s a gearcase 10,.

' bored with two cylindrical openings 11 that open into each other atone side in which are respectively mounted for revolutin,in*

'termeshing herring-bone gears 12, one of which is fixed to a shaft 13that recei es power from a suitable motor, not shown.

I At one end the gear. chambers are closed by.

a wall 141 which is bolted to the casing and at the other end by anintegral wall 14' which lies next the fwall 15 of the chamber of therefrigerating apparatus in which the pump is located. Directly below thepoint Qwh'ere the two gears lntermeshasaqnori zontally extending port16,which lalines with -i a hole 17, in the wal115through which:.the:.=

is takenup by the revolving gears. i

'gasto be compressed enters 'the-portlfi and Above theintermeshmg-gears, is a tan or reservoir 5 18, containing oil or otherrlliquid, suitable for sealingand lubrication,

from which at or near the end ofthe-gears zf two ports 19 lead downwardinto the gear,.=

'20, that is prolonged so that it opens into the tank 18 at or nearthe'top thereof, and 1nto such port and driven upward therethrough, isforced the mingled gas and liquid, separation of the oil and gas takingplace in the upper part of the tank 18 above the normal liquid leveltherein. It will be seen that by the relative location of the liquidinlet ports 19 and the outlet port 20 but a small volume of the liquidrequires to be acted upon ,by the pump and as the gas and liquid aremingled only for the short period required for their joint passagethrough the port 20, their contact exists only for a limited period oftime.

The tank 18 has a vertical wall or partition 21 that terminates at thetop just be low the normal liquid level, so that in effect the tankconsists of two chambers and oil or other liquid flowing from the top ofthe outlet 20, passes over the top of the partition 21 and finds its wayback into the pump by way'of a port 22 in the said partition 21 closeto'the bottom of the tank, such flow ofliquid over the partition 21aiding in the separation of the gas therefrom. To aid or-promote theseparation of the gas and liquid, a screen 23 may be placed just abovethe liquid level in the tank upon which the liquid falls after issuingthrough the port 20 above such screen. Over the top of the tank is acover '24 that serves as a bafile plate and it may be set in place soloosely as to allow the escape of separated gas or it may be a tight fitand provided with a hole for the escape of gas from'within the tank.

The gears rotate in the direction of the arrows applied thereto in Fig.2 and their teeth are so arranged that they mesh firstat the outsideedges of the gears. 1

It s to be understood that while our pump is especially advantageous asa: part of refrigerating apparatus, we do not restrict ourselves to itsuse only in that connection but, include inthe scopmof our protection,

its use in other relations consistently with the language or terms ofour claims. By the term gas, We include any aeriform fluid with whichihepump may deal.

What we claim is: e

1. A pump comprising a casing intermeshing gears mounted for rotation insuch casing, a port for delivering gasto said gears and a liquid tankhaving liquid inlet and outlet passages establishing communicationbetween the tank and the gears, said tank having a vertical partition,terminating below the level of liquid in the tank.

2. A pump comprising-a casing intermeshing gears mounted for rotation insuch casing, a port for delivering gas' to said gears and a liquid tankhaving liquid inlet and outlet passages establishing communicationbetween the tank and the gears, said tank having a vertical partition,terminating below the level of liquid in the tank, said parcommunicationbetween the tank and the gears, and a perforated baflle in the tankthrough which mingled liquid and gas from the gears is passed.

In testimony whoreof we hereunto afiix our signatures.

i RAYMOND W. TIBBETTS.

MYRON CURTIS.

